1 /* 2 * Copyright (C) 2003, 2006, 2008, 2009, 2010 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 27 #include "config.h" 28 #include "CString.h" 29 30 using namespace std; 31 32 namespace WTF { 33 CString(const char * str)34 CString::CString(const char* str) 35 { 36 if (!str) 37 return; 38 39 init(str, strlen(str)); 40 } 41 CString(const char * str,size_t length)42 CString::CString(const char* str, size_t length) 43 { 44 init(str, length); 45 } 46 init(const char * str,size_t length)47 void CString::init(const char* str, size_t length) 48 { 49 if (!str) 50 return; 51 52 // We need to be sure we can add 1 to length without overflowing. 53 // Since the passed-in length is the length of an actual existing 54 // string, and we know the string doesn't occupy the entire address 55 // space, we can assert here and there's no need for a runtime check. 56 ASSERT(length < numeric_limits<size_t>::max()); 57 58 m_buffer = CStringBuffer::create(length + 1); 59 memcpy(m_buffer->mutableData(), str, length); 60 m_buffer->mutableData()[length] = '\0'; 61 } 62 mutableData()63 char* CString::mutableData() 64 { 65 copyBufferIfNeeded(); 66 if (!m_buffer) 67 return 0; 68 return m_buffer->mutableData(); 69 } 70 newUninitialized(size_t length,char * & characterBuffer)71 CString CString::newUninitialized(size_t length, char*& characterBuffer) 72 { 73 if (length >= numeric_limits<size_t>::max()) 74 CRASH(); 75 76 CString result; 77 result.m_buffer = CStringBuffer::create(length + 1); 78 char* bytes = result.m_buffer->mutableData(); 79 bytes[length] = '\0'; 80 characterBuffer = bytes; 81 return result; 82 } 83 copyBufferIfNeeded()84 void CString::copyBufferIfNeeded() 85 { 86 if (!m_buffer || m_buffer->hasOneRef()) 87 return; 88 89 RefPtr<CStringBuffer> buffer = m_buffer.release(); 90 size_t length = buffer->length(); 91 m_buffer = CStringBuffer::create(length); 92 memcpy(m_buffer->mutableData(), buffer->data(), length); 93 } 94 operator ==(const CString & a,const CString & b)95 bool operator==(const CString& a, const CString& b) 96 { 97 if (a.isNull() != b.isNull()) 98 return false; 99 if (a.length() != b.length()) 100 return false; 101 return !strncmp(a.data(), b.data(), min(a.length(), b.length())); 102 } 103 104 } // namespace WTF 105